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Correct answer: D. Nothing keeps teammates out of one another's files, so two of them editing the same file overwrite each other's work
Explanation
The principle — isolation and coordination are different things; a team gives you the second only.
Why the key is correct — Anthropic states the consequence and the remedy together: two teammates editing the same file leads to overwrites, so break the work so each teammate owns a different set of files. Why it falls to you is stated separately — agent teams don't isolate teammates in worktrees. Nothing stops one teammate writing over another, so the partition is the protection.
Why the others are wrong — a worktree each is what teams do not give you. Equal chunks can still meet in one file. And a last write is not a merge: it discards the other version.
Remember this — split a team's work by who owns which files, not by how much each carries.
Sources — Anthropic's documentation on running agents in parallel, and on agent teams.
Sources
“Agent teams don't isolate teammates in worktrees, so partition the work so each teammate owns a different set of files.”
“Two teammates editing the same file leads to overwrites. Break the work so each teammate owns a different set of files.”
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